Apparatus for casting pipe



D. B. DIMICK V APPARATUS FOR CASTING PIPE June 30, 1925.

Filed Jan. 31, 1924 2 Sheets-Sheet 1 June 30, 1 925.

' D. B. DIMICK APPARATUSFOR cAsq-mq PIPE Filed Jan Patented June 30,1925.,

UNITED STATE' 1,544.06 PATENT optics.

DANIEL BAKER button, or BIRMINGHAM, ALABAMA.

APPARATUS FOR CASTING PIPE.

Application filed- January 31, 1924. Serial No. 689,810.

same.

The present invention relates to improvements in apparatus for ca'stmgpipe, and conslsts in certain improvements over the apparatusillustrated and described in my copending application, Serial #588,649,filed September 16, 1922.

In the application aforesaid, the sand was jolt-rammed into the mold atopposite sides of the spirally corrugated pattern, but certaindifliculties arose from this -method of ramming, consisting principallyin the fact that it was found impracticable to properly ram the mold onthe under sides of the corrugations. The more the mold was jolted, thegreater was the tendency of the sand to travel downward from the underinner curved surfaces of the corrugations. On the top and on the sidesof the corrugations, a perfect ram was secured, but upon the underportions, the sand was found to be soft. Various methods of silting inthe sand during jolt'ing were experimented with without a great deal ofsuccess however.

This condition in the ramming of the mold is, however, successfully metby the process of sand slinging. A Beardsley sand slinger, which is awell known machine recently put upon the market, is employed, which hasa capacity of approximately 1800 handfulls of sand a minute, and thisdevice throws the sand into the mold with great rapidity, and I find inactual practice that this method is accomplished with the desired resultso far as the uniform packing of the sand on the under sides of thecorrugations is concerned.

Another object of the invention'consists in providing a flexibleconnection betweenv the driving head and the corrugated pattern insteadof. the rigid connection as proposed in my prior application abovereferred to.

A further new development consists in providing the pattern with anumber of .small pins distributed throughout a relatively short sectionthereof for the purpose of roughing the sand. It is found'that with theplain corrugated cylinder, the act of unscrewing this out of the sandleaves the sand in a highly slick or polished condition, so much so thatthe iron will not lay quietly against the polished, sand. The result hasbeen that thebasting is more or less wormeaten or honeycombed.

With the foregoing and other objects in View, the invention will be morefullydescribed hereinafter, and will be more particularly pointed .outin the claims appended hereto.

In the drawings, wherein like symbols refer to like or correspondingparts throughout the several views,

Figure 1 is a side elevation with parts in I section showing anapparatus constructed in accordance with the present invention with aBeardsley sand slinger indicated in dotted lines.

Figure 2 is a side elevation, on an enlarged scale, of the pattern anddriving head..

Figure 3 is a longitudinal section taken through the parts shown inFigure 2.

Figure 4 is a bottom plan view of the driving head.

Figure 5 is a cross section taken on the line 55 in Figure 3, and

Figure 6 is an enlargedfragmentary section taken through that portion ofthe pattern which contains the roughing pins.

Referring more particularly to the drawings, the apparatus is moreparticularly described in my copending application re ferred to above,and the illustration in Figure 1, together with the followingdescription, will be adequate for the purpose of the present disclosure.

The frame of the machine is indicated at 7,'and an over-hanging head 8is provided in which is carried the threaded shaft 9.

The nut 10 travels up and down upon theplete elongated cylinder adaptedto fit down vertically into the sand within the mold indicated at 13.

The mold is carried upon a table 14 to which it may be afixed by thepins 15 or other appropriate means. The table 14: is

I provided at its underside with a bevel cirthrough a shaft 18 jonrnaledin an approcular series of teeth 16, which mesh with the drive pinion17. ThlS latter pinion is turned priate part of the mechanism and beingconnected to a suitable source of power, such for instance, as anelectric motor, which is preferably independent of the electricmotordotted lines, and when ramming the mold,

19 which drives the. pattern up and down.

The Beardsley sand slinger is'indicated in a continuously cylindricalspiral cavity in the sand when removed, both interior and exterior wallsof .whichare corrugated.

As above referred to, the method of sand slinging packs the sand.uniformly not-only on the tops and sides of the corrugations of thefpattern 11, but also on the underside.

thereo f The pattern is raised and simultaneously turned after theramming'is com lete in order to screw it out of the cylindricalcorrugated cavity in the sand produced by it This is accomplished by themac ine through the driving head 12.

The to of the pattern 11 and the driving head 12 1s modified to someextent over like parts in prior application. -In' this case the 1pattern is provided with a thickened collar portion 20, adapted to fitrather loosely within the inner and outer annular flanges or rin 21 and22 upon the lower part of the driving head 12.' The.rings.21 and 22 ofthe drivmg head are reinforced at proper points, and at these points aremade registering perforations 23 for receiving the ins .24, the pinspassing in through the or orations in both the rings 21 and 22 analining perforations inthe pattern collar 20. Preferably, only two pinsat diametrically opposite points are inserted, and as aforesaid, thereis a certain looseness in the fit of the collar within the rings. Thissecuresthe very desirable result of permitting the pattern 11 to adjustitself to a correct position with respect to the mold and the sandtherein, and, the mold will be unaffected by any variations in movementof the driving head or the shaft9. In thismanner, a; truer mold cavityis produced. I

Now, referring more particularly to Figures 3, 5 and 6, numerous 'orsmall steel picks 25 are shown as tted through a propriate openings made'in the wall-of e pattern 11 and projecting be o d the interior wallthereof, where same are shar nail. These pins or picks are preferab yarranged in ofi-set or staggered rela-' tion, and they are placedat-only a small cylindrical section of the pattern 11, preferably ashort distance up from the base of the pattern. The function of thesepins is to rou h the slick or polished sand.

Int e operation of the device, the sand slinger is caused to throw inthe sand to the mold about the pattern during the rotation of the atternon the table 14, which table'prefera ly rotates on ball'bearings and isvery true. The table turns at the. rate of approximately eightrevolutions .per minute. The compactness of the ram can be regulated inthree ways, namely, speed of the revolving table, speed of the sand'slinger motor, and rate of feed of sand'into the hopper of the sandslinging machine. It requires about two minutes to throw the sand intothe mold to complete the operation. The entire operation is mechanicaland a perfect ram on all parts of the corrugations or threads isobtained.

The pattern is then screwed upwardly and out of the sand, being drivenby the pins 24.

' sand, and the lower section of the attern sand,

will tend to press back this roughe but it will not slick or polish it.

The-motors for lifting and lowering. the pattern and for driving thetable are controlled by appropriate switches and control boxes, but asthese form no part of the present invention, they are not illustrated.

After the prattern is withdrawn, the molten metal is pou ed into themold, and a relatively thm walled continuously cylindrical corrugatedcast pipe. is produced, all in a single operationwithout any joints.

It is obvious that various changes and modifications may be made in thedetails of construction and desi of the above specifically described emodiment of this 1nvention without departing from the spirit thereof,such changes andmodifications being restricted only by the scope of the..followin claims.

Whatis' claimed is:

1. In an apparatus for castin pipre, a driving head and a continuouslycy in ical'and corrugated taneously li ed and rotated out of acontinously cylindrical cavity in the-sandin a mold by said dri head,and meansfor flexibly sup rting 0 pattern from said driving hea ticallyreciprocating and rotating head,

means for lifting and lowering and for rotating said head, said headprovided with internally and externally spaced rings at its lowerportion, a pattern having a con- 10 tinuously spiral corrugationtherearound provided with a collar adapted to loosely fit in the spacebetween said rings, said rings and collar having registeringperforations at substantially diametrically op site points, and pinsadapted to pass removably through said alined perforations for thepurpose of flexibl head, ut causing said pattern to rotate and rise withthe head.

- DANIEL BARR DIMICK.

supporting the pattern from the

